| abstract |
Novel amphoteric tricyclic compound represented by the following formula: <IMAGE> wherein R1 represents a hydrogen atom or a halogen atom; X represents -O-, -CH2O-, or -OCH2-; and Y represents a C2-C5 alkylene group which may optionally be substituted with a lower alkyl group, and a pharmacologically acceptable salt thereof are disclosed. Also disclosed are a pharmaceutical composition comprising the same and a method for treatment of an allergic disease or bronchial asthma. |